So we have been using the Midland MicroMobile MXT400 for about a year now.
Several thoughts on this, but first, full disclosure Midland USA is a gear sponsor of ours.
Having said that, we’ve been using the MXT400s daily in both vehicles to communicate back and forth.
The MXT400s have been great. Clear communication and no issues whatsoever as far as function.
The great benefit to these units is the extended range of the 40W radios. When we are boondocking our RV in an area with no cell coverage and one of us takes the Jeep out for a run or into town, it has been solid to remain in communication with our basecamp. Pretty nice to be able to communicate 14 miles away when someone in your party needs something.
On the highway we are able to have our Jeep take off miles ahead and scout out locations for the RV and radio back clear comms.
But as the other members have said, the unit only has the full benefits if others in your caravan are also using them.
Otherwise even when talking with others on GMRS, you are limited by the range of their units. For typical off road comms on a trail run though, a handheld unit like the GXT1000 is just fine.
Bottom line if multiple people in your group aren’t using the MicroMobile you’ll be limited in your range of comms by those who don’t have them.
Also for what it is worth the furthest distance I’ve tested the units out on public lands with little obstruction has been 20 miles. In a major city with a lot of obstruction I’ve gotten coverage as far as about 6 miles. Hope that helps.
Eric